Weir shutter



F. JERMA WEIR SHUTTER April 8, 1930.

Filed May 24, 1928 Patented Apr. 8, 1930 QFHCE WEIR SHUTTER Application filed May 24, 1928, Serial No. 280,273, and in Czechoslovakia January 18, 1928.

This invention relates to a hydrostatic, collapsible, roof-shaped weir shutter of the kind composed of horizontally hinged leaves which cover a well adapted to be set into communication with the high water for raising the weir and with the low water for lowering the same.

The object of the invention is to improve the weir shutter with a View to render it easily controllable and to reduce the size of the substructure as compared with the effective height of the weir, and the invention consists in forming the low water side of the shutter and the upper portion of the high water side out of two hingedly connected leaves which move together with struts which support the outer leaf into and out of the well, a third leaf which forms the lower portion of the high water side of the shutter being hinged to the substructure and adapted to slide on the upper leaf during the adj ustment and to cover the same when the shutter is collapsed.

Figs. 1 to 5 of the accompanying drawings represents cross-sectional views of different forms of the improved weir shutter.

The weir shutter comprises three horizontally hinged leaves 1, 2 and 3 which, when extended, form a roof-shaped structure. The leaves '2 and 3 are hinged together at 8 and form the low water side and the upper portion of the high water side of the shutter. The leaf 3 is hinged to the substructure at 9. The leaf 2, which is at the high water side, is supported at its free end by pivoted struts 6 which swing together with the two leaves into the well of the substructure when the weir is lowered.

The lower portion of the high water side of the shutter is formed by the leaf 1 which is pivoted at a to the substructure and which is supported at its free end on the leaf 2 so as to slide on the latter during the move ment and so as to cover it completely when the shutter is entirely collapsed. For raising the weir, the space under the shutter is, in known manner, set in communication with the high water 18 through a duct 19. F or lowering the weir the duct 19 is closed to the high water and set into communication with the low water '17. The upward movement of the shutter is limited by abutments 10 at both sides of the weir.

In the construction shown in Fig. 1, the struts 6 are hinged at 5 to the leaf 2 and at 7 to the substructure at the bottom of the well., The collapsed position of the shutter is indicated by the reference numerals 1, 2, 3', 5 and 6. It will be seen that the water acts continually on the entire surface of the leaf 3 which only supports part of the high water pressure acting on the leaf 2, the remainder of the pressure being supported by the struts 6. The shutter will therefore be able to rise easily and to be easily retained in any desired intermediate position. At the same time the substructure is comparatively small, the distance between the hinges 4 and 9 being only double the effective height h of the weir, as indicated in Fig. 1.

The device just described may be modified with a view to reduce the depth of the well. Fig. 2 shows such a modificationwhich consists in supporting the lower ends of the struts 6 loosely on rails 13 by means of rollers 11.

Whilethe weir is raised, the rollers bear againstabutments 12 and form a rigid support for the leaves 1 and 2. When the weir is lowered and when the hinges 5 reach the rail track, the struts will be relieved of pressure and will, on further lowering of the weir, slide along the track to the position 5', 11. The reverse movement will take place when the weir is raised. Preferably the leaf 2 is also provided at the hinge 5, with rollers whereby it can be supported on the rails 13.

In a further modification, shown in Fig. 3, two inclined tracks 14 and 15 are provided whereon the ends of the struts 6 are adapted to slide in the lowest position of the weir. While the leaf 2 is subjected to pressure, the struts 6 bear with their rollers 11 against the hinge 9. On the weir being lowered to its full extent, the struts move down the inclines 14 and 15 into the position 6.

In the construction shown in Fig. 4:, the struts 6 are movable about the same hinge as the leaf 3 and, instead of being hinged to the leaf 2, they rest normally against a lug 16 on the latter. A curved guide-way 13 is provided onto which the leaf 2 descends when the weir is lowered, and whereon the lug 16 is guided into the end position 16 while the struts 6 remain on the sills 12 which support the guide-ways. When the weir is raised from the collapsed position, the struts 6 are automatically picked up by the lugs 16 and resume their supporting function.

Fig. 5 shows a construction which only differs from that of Fig. 1 in that the leaf 2 is angular and carried beyond the ridge of the roof structure. Since the leaf 3 is thus shortened, the struts 6 can be shortened as well, and the hinge 7 can be arranged on a higher level so as to reduce the depth of the well.

I claim: V

1. A hydrostatic weir shutter of the character described comprising a substructure formed with a well, a normally roof-shaped,

V collapsible shutter structure supported on the substructure above the well, the low water side and the upper portion of the high water side of the shutter structure being formed of two hingedly connected leaves, pivoted struts supporting the free end of the outer leaf so as to allow the two leaves to collapse into the well, the lower portion of the high water side of the shutter structure being formed of a leaf which is pivoted to the substructure and supported at its free end onthe leaf forming the upper portion so as to slide thereon when the shutter is adjusted and so as to cover the same when the shutter is in collapsed position.

2. A weir shutter as claimed in claim 1 wherein the struts are loosely supported on the substructure and adapted to be slidably displaced on the latter in the lowest position of the shutter.

FRANTISEK JERMAR. 

